P02E8

DTC P02E8 or P02E9

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P02E8
- Diesel Intake Air (IA) Flow Position Sensor Circuit Low Voltage

DTC P02E9
- Diesel Intake Air (IA) Flow Position Sensor Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The intake air (IA) valve is a normally open valve and is only operated during a DPF regeneration. The position of the IA valve is controlled by the engine control module (ECM). The IAF Valve system uses a position sensor located within the valve assembly to monitor the position of the valve. The position sensor has the following circuits:

* 5-volt reference circuit
* Low reference circuit
* Signal circuit

The IAF valve uses a motor to move the valve to a closed position and spring tension returns it to the open position. The motor has the following circuits:

* Motor control 1 circuit
* Motor control 2 circuit

Conditions for Running the DTC

P02E8 and P02E9
* DTCs P0698 or P0699 are not set.
* The ignition is ON.
* DTCs P02E8 and P02E9 run continuously.

Conditions for Setting the DTC

P02E8

The IAF valve position is more than 0.102 volt for 3 seconds.

P02E9

The IAF valve position is less than 4.75 volts for 3 seconds.

Action Taken When the DTC Sets

DTCs P02E8 and P02E9 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P02E8 and P02E9 are Type A DTCs.

Circuit/System Verification

* Command the IA valve from 100 percent to 0 percent. The IAF Valve Commanded Position and the IAF Valve Position parameter should match.
* After the engine has been running, turn OFF the ignition. Observe the IA Valve Position parameter fluctuates between 100 percent and 0 percent several times.
* Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the IA valve. Allow up to 2 minutes for the ECM to completely power down.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.

• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 volts between 5-volt reference circuit terminal F and ground.

• If less than 4.8 volts, test 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
• If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool IAF valve position voltage is less than 0.1 volt.

• If greater than 0.1 volt, test the signal circuit terminal E for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal E and the 5-volt reference circuit terminal F of the IA valve harness connector. Verify that the voltage is more than 4.8 volt.

• If less than 4.8 volt, test the IA valve signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits test normal, replace the IA valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Refer to Programming and Relearning Programming and Relearning
* Intake Air Valve Replacement Verification Tests